I did see that Randakks kit were 90% brown o-rings. Gots to be those fancy Fluorocarbon aka Viton ones. I'm getting towards the bottom of my supply of float bowl o-rings in nitrile, which works well, and may see what the bump in price would be for the Viton. As John H told me not all Viton is created the same. There are different subfamilies so I have to get the right ones if I am going to phase over.